Improvement in dental plates



UNITED STATES WILLIAM D. HOLBROOK, OF WAUKESHA, WISCONSIN.

IMPROVEMENT IN DENTAL PLATES.

Specification forming part of Letters Patent No.

August To all whom it may concern:

Be it known that I, WILLIAM D. HOLBROOK, of Waukesha, in the county ofWaukesha and State of Wisconsin, have invented certain new and usefulImprovements in Dental Plates; and I do hereby declare that thefollowing is a full, clear, and exact description of the invention,which will enable others skilled in the art to which it pertains to makeand use the same, reference being had to the accompanying drawings, andto the letters of reference marked thereon, which form a part of thisspecification.

The object of my invention is to provide a device for more permanentlysecuring the lower plate of an artificial set of teeth to the gums; andconsists in providing that part of the plate in which the gums rest witha groove or air-space, by means of which, when the air is expelled, theplate is securely held in its place by atmospheric pressure.

A further object attained by the groove or air-space is in relieving thebony portion of thegums from direct contact with the plate, and thusallowing the plate to press against the more fleshy portions of thegums, whereby the teeth are used with much greater ease and comfort, allof which is further explained by reference to the accompanying drawings,in which 213,820, dated April 1, 1879; application filed 27, 1878.

Figure 1 represents an impression in plaster-paris. Fig. 2 represents acast taken from the impression upon which my improved plate is formed.

B B in Fig. 1 represent an excavation or groove. 0 crepresent thesurface of the impression. AA in Fig. 2 represent the raised ridge ofthe cast on which the plate is formed. 0 G in Fig. 2 represent thesurface-borders of the cast on which the plate is formed.

It is obvious that a plate formed upon the cast shown in Fig. 2 willhave a groove corresponding with the ridge A. However, 1 do not limitmyself to this peculiar device for forming said groove. as the same maybe furrowed out after the plate has been constructed in the ordinarymanner; but

What I do claim as new, and desire to secure by Letters Patent, is-

A lower dental plate furnished with an airspace runuing its whole lengthto permit the plate to rest lightly on the bong substantially asdescribed.

In testimony that I claim the foregoing as my own I affix my signaturein presence of two witnesses.

WILLIAM D. HOLBROOK.

Witnesses: i

ROBERT CRAWFORD, O. S. HAWLEY.

